lib-storage: mailbox_attribute_get*() - Fail early on with empty key lookup

This fixes using mail_attribute_dict with dict-sql.

diff --git a/src/lib-storage/mailbox-attribute.c b/src/lib-storage/mailbox-attribute.c
index 5bd8c1c0f7d9f575f9926a5682e3142560faf7cd..f27df7fa8654b1f862453670a924a8d520a25867 100644 (file)
--- a/src/lib-storage/mailbox-attribute.c
+++ b/src/lib-storage/mailbox-attribute.c
@@ -364,6 +364,11 @@ mailbox_attribute_get_common(struct mailbox *box,
        const struct mailbox_attribute_internal *iattr;
        int ret;
 
+       if (key[0] == '\0') {
+               /* never exists, and may cause dict lookup errors */
+               return 0;
+       }
+
        iattr = mailbox_internal_attribute_get(type_flags, key);
 
        /* allow internal server attributes only for the inbox */